What is -XX:NewRatio JVM parameters in java - Setting young and old generation ratio

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In this core java tutorial we will learn What is -XX:NewRatio JVM parameters in java.

Contents of page >

• What is -XX:NewRatio JVM parameter in java?
• Examples of using -XX:NewRatio VM option in java >
• Summary -

Before learning about -XX:NewRatio JVM parameter in java we must know about java heap memory structure.

Earlier we read about JVM Heap memory (Hotspot heap structure)  in java consists of following elements>

1. Young Generation
• 1a) Eden,
• 1b) S0 (Survivor space 0)
• 1c) S1 (Survivor space 1)
2. Old Generation (Tenured)
3. Permanent Generation.

What is -XX:NewRatio JVM parameter in java?

-XX:NewRatio : NewRatio controls the size of young and old generation.

-XX:NewRatio sets the ratio between young and old generation in JVM heap memory in java.

Examples of using -XX:NewRatio  VM option in java >

Example1 of using -XX:NewRatio  VM option in java >

-XX:NewRatio=3 means that the ratio between the young and old/tenured generation is 1:3.

In other words, the combined size of the eden and survivor spaces will be one fourth of the total heap size.

Example2 of using -XX:NewRatio  VM option in java >

-XX:NewRatio=2 means that the ratio between the young and old/tenured generation is 1:2.

In other words, the combined size of the eden and survivor spaces will be one third of the total heap size.

Summary -

So in this core java tutorial we learned what is -XX:NewRatio JVM parameters in java. And how to use -XX:NewRatio VM parameter with examples.

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Labels: Core Java Garbage collection in java JVM parameters VM/JVM options